Air-pump.



sl. iA. SNELL. 'AIB PUMP.

APPLICATION FILEI) DEC.I2| 19H.

Patented Jan. 28, 1919.

UNTTED STATES PATENT FFTCE.

SAMUEL A. SNELL, OF MINERAL RIDGE, OHIO, ASSIGNOR TO THE MOON BROTHERSMANUFACTURING COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MIS-SOURI.

AIR-PUMP.

Specification of Letters Patent.

Patented Jan. 28, 1919.

To all whom t may concern:

Be it known that I, SAMUEL A. SNELL, a citizen of the United States, anda resident of Mineral Ridge, in the county of Trumbull and State ofOhio, have invented a certain new and useful Air-Pump; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it-appertains to make and use the same,'ref erence being had to theaccompanying drawings, and to the characters of reference markedthereon, which form a part of this speciication.

My invention has for its object to produce an eiiicient pump that may bemade at a low cost ofproduction.

Tire pumps have heretofore been made by` uniting the cylinders with acast iron base by forming a thread on the two parts and threading thecylinders into the castings. By my invention is provided aA pump whereinthe base and fparts may be made from sheet metal parts whereby the pumpmay be made largely by die stamping and thus pumps containing myinvention may be rapidly constructed and consequently at a low cost. Myinvention not onlyv relates to forming an efficient pump of diestampings, but also to forming one that is durable and which will standthe strains of long continuous and rough usage. Other advantages andfeatures of the invention will appear from the following description ofa pump containing the invention and from the drawings in which the pumpis illustrated.

Figure 1 of the drawings illustrates a vertical sectional view of thepump, Fig. 2 is a larger sectional view of the lower end of the pumpshowing the manner in which the cylinders are placed in the base beforethey are inally secured in their relative positions. Fig. 3 is a viewsimilar to that shown in Fig. 2 showing the cylinders finally secured inthe base. Fig. 4 is a top view of a base, and Fig. 5 is a view of partof the base. Fig. 6 is a view of part of one of the piston rods and Fig.7 is a sectional view taken on the line 7-7 indicated in Fig. 6 showingthe means used for securing the handle and the piston in position.

1 is the low pressure cylinder and 2 is the high pressure cylinder ofthe pump. They are provided with piston rods 3 and 4 to.

which are secured the pistons 5 and 6. The pistons 5 and 6 arem providedwith leather cups 7 and 8 of the type well knownin the art. The edge ofthe leather cup 7 is turned. downward, while the edge of 'the leathercup 8 is turned upward.

The cylinders 1 and 2 are' secured in a base 9. The base 9 is formed 0ftwo parts, the upper part 10 being an oblong member formed of sheetmaterial having stepped up portions 11 and 12. The portion 12 isprovided with openings 13 and 14 surrounded by depending flanges 15 and1G. The cylinders 1 and 2 are provided with iiattened beads 17 'and 1Snear the lower ends. The cylinders 1 and 2 are inserted in the openings13 and 14. The under curve portion between the undersides of the beads17 and 18 and the lower ends of the cylinders 1 and 2 fit the curvedportions formed by forcing the flanges 15 and 16 downward in theformation of the upper part 10 of the base 9 when the said upper part 10is stamped by means of a press. As shown in Fig. 2, the ends of thecylinders are inserted into the upper part 10 of the base 9 until theflattened beads 17 and 18 rest against the p0rtion 12 of the part 10.The wide annular area of the undersides of the beads resting against theupper side of the portion 12 of the base forms a sealing area when thecylinders are secured in the openings 13 and 14.

After the cylinders are inserted in position, the lower edges are forcedoutward and so as to clench over the corners of the lower edges of theflanges 15 and 16 and thus draw the beads 17 and 18 against the surfaceof the portion 12 of the base. The metal of the cylinders being placedagainst the corners of the lower edges of the flanges 15 and 16, tightlyseals the cylinders in the base 9 and at the same time securely holdsthe cylinders in their positions notwithstanding the rough usage towhich the pump may be submitted. The wide area of the beads and thecleuch of the lower edge of the cylinders around the corners of theianges not only tightly seals the cylinder, but also keeps the cylindersin their parallel relation to each other and in right angular positionsrelative to the base.

Vhen the edges of the cylinders are turned while the ends of thecylinders below the beads are also flared to the same eXtent whereby thesurfaces of the cylinders below the beads and the surfaces of theflanges are brought into close sealing contact and also to a certainextent the connection between the cylinders and the base isstrengthened. The flanges 15 and 16 being turned down ward the cornersformed between the inner surfaces of the flanges and the portion 12 ofthe base will be rounded which permits the cylinders to be inserted inthe flanges although the diameters of the flanges may be small enough toform an exceedingly tight fit between the cylinders and the flanges,while if the flanges 15 and 16 were raised, the cylinders could not beinserted in the flanges without a great deal of diliiculty owing to thefact that the corners of the lower ends of the cylinders would engagewith the corners of the flanges. The curve of the upper corner of theflanges not only fits the curve of the beads of the cylinders, but thecorners of the flanges form means whereby the lower ends of thecylinders grip the flanges, the metal of the cylinders being forced withgreat pressure against the square corners of the flanges andconsequently are more or less penetrated by the square corners whichtightly hold the cylinders. The ends of the cylinders being turned overthe corners of the flanges, the pistons 5 and 6 may pass the lower endor edges of the cylinders without causing the cups 7 and 8 to bedamaged. Ordinarily, if the cups 7 and 8 pass the lower edges of thecylinders, the rough edges will soon destroy the cups. In theconstruction shown, the rounded edges of the lower ends of the cylinderprevents any injury to the cups. rThe cup 7 which is turned downward maythus pass to the very extremity of the cylinder 1 without beingdestroyed. In constructions of this type,

. the cylinders are usually threaded into the base. rlhe cylinders aremade of thin metal .and consequently when the threads are cut into themetal they weaken it. By my invention threading, welding and brazing areentirely done away with, and the pump is so constructed that it may bemade largely by die pressing.

The base 9 is closed by the part 19 which is provided with two embossedportions 20 that rise to the inner surface of the part 10 of the base.Ihe oblong member 19 is sealed and clenched by the inturned edge orflanges 21 of the part 10 of the base. The central portion of the part19 is located close to the ends of the cylinders 1 and 2 and yet at adistance sufficient to allow the air to pass from the cylinder 1 to thecylinder 2. The

embossed portions 20 are located at opposite ends of the oblong base 9and beneath the points where the feet of the operator are usually placedin operating the pump. This arrangement strengthens the base to a greatextent.

rllhe rods 3 and 4: are provided with means for securing the pistons andthe handle in position. The rods are provided with channels 22semi-circular in form near the upper and lower ends of the rods. Thechannels are formed in the lower ends just above the pistons, while inthe upper ends they are formed at points about equal to the diameter ofthe handle from the upper ends. Wire rings 23 are placed in the channels22. The pistons 5 and 6 are clamped against the wire rings by suitablenuts 24;. The handle 25 is also secured between the rings 23 and washers26 by the nuts 27. The upper rings 23 on the rod 4 coperates with thepacking nut 28 to form a limiting stop in the downward movements of thepistons. The channel and rings form a means in conjunction with the nutsfor holding the parts together. This arrangement is an efficient meansfor that purpose and may be made at a low cost of production.

1 claim:

1. In an air pump, the combination of a cylinder and a base, the basehaving a depending flange, the cylinder having a flattened bead and aflaring edge, the flange gripped between the bead and the flaring edge,the surface of the bead and the end of the cylinder fitting the topsurface of the base and the flange for sealing the connection betweenthe base of the cylinder.

2. In an air pump, the combination of a pair of cylinders and a base,the base formed of two sheet metal parts sealed together, the edge ofone overlapping the edge of the other, one of the sheet metal partshaving openings and depending flanges surrounding the openings, thecylinders having Hattened beads located near the lower ends and flaringedges located at the ends, the flaring edges of the cylinders grippingthe corners of the flanges to clench the edges of the flange and topress the flattened beads against the top of the sheet metal part, thecylindrical surfaces below the beads fitting the interior of theflanges, `the other of the sheet metal parts located in proximity to thelower ends of the cylinder to permit air to pass from one cylinder tothe other.

1n testimony whereof, 1 have hereunto signed my name to thisspecification.

SAMUEL A. SNELL.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

